Abstract
In optically pumped submillimetre lasers, the laser molecule is excited from a rotational level of the ground vibrational state to a specific rotational level of an excited vibrational state. A population inversion can be achieved not only for the directly excited transition but also for rotational transitions immediately below this transition. With appropriate cavity adjustment, a formic acid laser has been operated simultaneously on three such transitions. When a non-linear detector is used, a low-frequency mixing product at approximately 1 MHz is produced. This phenomenon has been applied to produce phase modulation of a Mach-Zehnder interferometer. An accurate measurement of the refractive index of Mylar has been made with this instrument.
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